|
| Author |
Message |
    
Gustavo Sanchez
New member
Username: poco
Post Number: 2
Registered: 01-2008
| | Posted on Thursday, June 05, 2008 - 10:00 pm: | 
|
In light of the fuel prices, could someone please advised me if running my twin 120 Lehman at 13,500 RPM or some where below 18,000 harm my engines, and is the fuel savings worht the low RPM. Always appreciate your response! Thank you. |
Fred Frog
Member
Username: lilypad
Post Number: 26
Registered: 01-2008
| | Posted on Friday, June 06, 2008 - 02:03 pm: |
|
To start with, you should be talking about 13 HUNDRED RPM not 13 THOUSAND RPM. A lehman will self destruct long before you get it up to 13,000 revs.
Anything above about 1500 RPM will create enough heat to keep the carbon at a minimum and your engine life will probably not suffer. Below that RPM range and you may see that the temperature does not come up to 180 degrees (give or take a few) When a diesel doesn't come up to temperature it doesn't burn the fuel as completely and efficiently. Some of that unburned fuel deposits itself on the rings and pistons, eventually causing additional wear and blowby.
One can run at slower RPM's if you bring it up to speed 2000 RPM or so for 15 minutes every so often. Some advise as often as 2 hours of slow running, some say after every 4-6 hours of slower running. The higher speed will bring the temp up and let it burn off the deposits. The time at that speed is important to allow it to completely burn, so don't just run it up for 5 minutes and think you're doing all you need to do.
Economy wise you will see a marked decrease in fuel use at 1500 versus 2000. I run my engine at 1750 which is a comfortable sound and speed for my boat. I burn 2.1 GPH in my 120 Lehman at that speed.
K |
|
|
|
Product Categories |
| Engine Parts · By Brand |
| Engine Manuals · By Brand |
| Books |
| General Repair and Maint. |
| Care and Repair |
| · Adhesive and Sealants |
| · Bottom Cleaners |
| · Cleaners Wax and Polish |
| · Mops Brushes and Sponges |
| Covers and Tops |
| · Bimini Tops · Hardware |
| · Cover Accessories |
| · Motor Covers |
| · Universal Boat Covers |
| Electronics |
| · Gauges and Compasses |
| · Mounts and Accessories |
| Electrical |
| · Batteries & Chargers |
| · Battery Accessories |
| · Dockside Electrical |
| · Electrical Terminals |
| · Electrical Wire, Cable |
| · Fuses, Fuse Holders |
| · Switches |
| · Wire Ties, Clips, Tape |
| Fuel Systems |
| · Fuel Tanks |
| · Fittings, Fills, Vents |
| · Hose & Primer Bulbs |
| · Filters, Senders, Caps |
| Hardware |
| · Deck Cabin Hardware |
| · Molding and Rub Rails |
| · Rails and Fittings |
| · Snaps Shackles and Hooks |
| · Windshield Hardware |
| Lighting |
| · Cabin Lights · Light Bulbs |
| · Navigation Light Parts |
| · Navigation Lights |
| · Spotlights · Parts |
| Mooring and Dock |
| · Boat Fenders · Boat Hooks |
| · Buoys and Markers |
| · Deck Cleats · Dock Edging |
| · Dock Parts and De-Icers |
| · Fender Covers and Holders |
| · Keelshield / Toon-Tectors |
| · Ladders and Platforms |
| Prop / Trim /
Transom |
| · Jack Plates, Wedges |
| · Mounting Brackets |
| · Outboard Stands |
| · Trim Tabs, Stablizers |
| · Prop Nuts, Locks, Pins |
| · Propellers · Wrenches |
| Pumps |
| · Aerator Pumps |
| · Bilge Pumps |
| · Drain Plugs and Tubes |
| · Hose · Through Hull Fittings |
| Rope and Cordage |
| · Anchor Line · Dock Line |
| · Fender Line · Bulk Rope |
| · Shock Cord and Bungee |
| Safety Products |
| · Horns Bells and Whistles |
| · Mirrors |
| · Vents Blowers and Hose |
| Sanitation |
| · Fresh Water Pumps |
| · Marine Toilets |
| · Sanitation Chemicals |
| · Sanitation Pumps/Hose |
| · Water/Waste System Parts |
| Seating |
| · Deck Chairs and Tables |
| · Fishing Seats |
| · Lounge Seats |
| · Pontoon Furniture |
| · Seat Bases and Pedestals |
| Steering / Control |
| · Control
Boxes |
| · Control
Cables |
| · Hydraulic
Steering |
| · Mechanical
Steering |
| · Rigging · Steering
Wheels |
| Tools / Shop Supplies |
| · Lubricants & Additives |
| · Motor Flushers |
| · Tools & Test Equipment |
| Trailering |
| · Boat Guides/Motor Support |
| · Hitches Balls Couplers |
| · Rollers Brackets Springs |
| · Tires Wheels and Carriers |
| · Trailer Hubs & Bearings |
| · Trailer Jacks |
| · Trailer Wiring and Lighting |
| · Winches Straps Tie Downs |
| Manufacturer List |
|
